And get this - he says he dreamt up the idea to invest in Bank of America in the bathtub on Tuesday. He liked it, so he called Moynihan on Wednesday morning. The entire story of how it happened is available in a video embedded below, as told to Becky Quick by Buffett.

The story (and the mental image) is amusing but also important - it suggests that the Obama Administration and/or the Treasury, did not have a hand in the agreement.

And to make it very clear that Treasury or Obama had no hand in the arrangement, which makes the news even better for Bank of America.

So does this - the deal is expensive for Buffett, and a good deal for Bank of America. He says in some ways, it's better than the deal he gave to Goldman Sachs in 2008.

But obviously, it's a great deal for Buffett.

Buffett's investment alone is now worth $700 million more than it was when he bought it.